138 " ENDEAVOUR " SCIENTIFIC RESULTS. 



Head broad and much depressed, armed with spines and 

 serratures. Angle of preopercnlum with two or more spines ; 

 no antrorse spine on its lower face. Teeth usually villiform, 

 sometimes cavdiform ; in bands on the jaws and palatines, and 

 two separate groups on the vomer which are set lengthwise 

 along the shaft of the bone. Scales large or small, in 30 

 (J. grandisquamis, Regan) to 110 (I. uematophthalmus, Gunther) 

 rows. Lateral line smooth, or armed with spines, partially or 

 for its whole length. 



The following key will assist in the determination of the 

 Australian species. 



a. Eyes smaller and round, the interorbital space about 

 equal to their vertical diameter. 



b. Tail with two large dark blotches. Infraorbital ridge 

 with one spine bosschei. 



bb. Tail without dark blotches. Infraorbital ridge with 

 four spines ...malayanus. 



aa. Eyes larger, elliptical, the interorbital space less than 

 their vertical diameter. 



c. Anterior third of lateral line with distinct, upstanding 

 spines. 



d. Upper preopercnlar spine very large, about as 

 long as the eye mac r acanthus. 



dd. Upper preopercular spine much shorter than the 

 eye. 



e. Infraorbital ridge expanded outwards poste- 

 riorly, overhanging the cheek tuberculatum. 



ee. Infraorbital ridge not overhanging the cheek 

 posteriorly jugosus. 



co. Anterior third of lateral line with indistinct pros- 

 trate spines ham'sii. 



ccc. Only a few antei-ior lateral line scales with spines. 



/. Teeth of palate enlarged, cardiform diver si dens. 



ff. Teeth villiform. 



g. An orbital tentacle. Dorsal and caudal with 

 blackish lines nematophthahn us. 



gg. No orbital tentacle. Fins without blackish 

 lines ...parilis. 



